Military Wiki
Role Experimental aircraft
Manufacturer Lockheed Corporation
First flight April 26, 1951
Retired 1960
Primary user United States Air Force
Developed into AQM-60 Kingfisher

The Lockheed X-7 (dubbed the "Flying Stove Pipe") was an American unmanned test bed of the 1950s for ramjet engines and missile guidance technology.

Design and development

The X-7 was carried aloft by a B-29 or B-50 Superfortress carrier aircraft. A booster rocket ignited after launch and propelled the vehicle to a speed of 1,000 mph (1,625 km/h). The booster was then jettisoned, and the underslung ramjet took over from that point. The X-7 eventually returned to Earth, its descent slowed by parachute. A maximum speed of 2,881 mph (4640 km/h / Mach 4.31) was attained, setting a record for fastest air-breathing aircraft at the time. A total of 130 X-7 flights were conducted from April 1951 to July 1960.

The X-7 was also used to test HEF-2 and Hi Cal-3 zip fuel, which has a superior heating value of 26,500 Btu/lb. compared to hydrocarbon fuel with 18,400 Btu/lb.[1]

Specifications (X-7A-1)

General characteristics

  • Crew: None
  • Length: 32 ft 9 in (9.98 m)
  • Wingspan: 12 ft (3.66 m)
  • Height: 7 ft (2.1 m)
  • Loaded weight: 8,000 lb (3,600 kg)
  • Powerplant:
    • 1 × Alleghany Ballistics Laboratories X202-C3 solid-fuel rocket, 105,000 lbf (467 kN)
    • 1 × various Marquardt MA20 ramjets under test, ()


  • Maximum speed: Mach 4.31 (2,881 mph, 4,640 km/h)
  • Service ceiling: 106,000 ft (32,317 m)

See also


External links

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